PIC16F627-04I/SS - 8-bit MCU, 4MHz, 1.75KB Flash, SSOP-20 | Microchip
MPN: PIC16F627-04I/SS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.18 | $2.18 |
| 10 | $1.96 | $19.60 |
| 100 | $1.74 | $174.00 |
| 500 | $1.56 | $780.00 |
| 1,000 | $1.38 | $1,380.00 |
PIC16F627-04I/SS Overview
An 8-bit microcontroller (MCU) is a small computer on a single integrated circuit containing a processor, program memory (Flash/ROM), data memory (RAM), and peripherals such as timers, ADC, communication ports, and I/O pins. Within the broader semiconductor hierarchy, an MCU belongs to the microcontrollers category, which sits under Integrated Circuits, then Logic/Memory ICs. The PIC16F62X family uses a Harvard architecture separating program and data buses, allowing simultaneous instruction fetch and data access for higher throughput versus von Neumann designs.
Key features of the PIC16F627-04I/SS include 224 bytes of RAM, 128 bytes of EEPROM, 16 digital I/O pins, a USART module for serial communication, two analog comparators, a capture/compare/PWM module, and a 10-bit ADC core shared with external inputs. Brown-out reset, power-on reset, watchdog timer with on-chip RC oscillator, and code protection enhance field reliability. The 20-pin SSOP package reduces board footprint versus PDIP while retaining breadboard-friendly 0.65 mm pitch.
Typical applications include industrial control, sensor interfaces, low-cost motor control, LED lighting controllers, remote transmitters/receivers, smart sensors, security systems, and consumer appliances. The PIC16F627-04I/SS is a frequent choice for legacy designs transitioning from PIC16C/16F84 to modern Flash-based PICs. A development cycle using MPLAB X IDE, XC8 compiler, and PICkit programmers accelerates prototyping.
When designing with this MCU, ensure the supply voltage stays within 2.0V-5.5V and that decoupling capacitors (100 nF + 10 uF bulk) are placed close to VDD/VSS. Note that the PIC16F627 is a Flash-based predecessor to the PIC16F627A (later silicon revision); firmware code is generally portable but verify peripheral registers. This page synthesizes distributor stock, pricing tiers, drop-in same-package alternatives, and practical design notes not aggregated on a single manufacturer page.
Drop-in alternatives for PIC16F627-04I/SS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16F627-04I/SS (same form factor and footprint) — differing in Package, Operating Temperature, Analog Comparators, Timers, RoHS Status.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F627-04/SS
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC16F627-04I/SO
✅ Drop-In✓ In Stock
$1.59 / Unit
View Datasheet →PIC16F627-04E/SS
✅ Drop-In✓ In Stock
$1.52 / Unit
View Datasheet →PIC16F627-04I/P
✅ Drop-In✓ In Stock
$2.3 / Unit
View Datasheet →PIC16F627A-I/SS
✅ Drop-In✓ In Stock
$1.12 / Unit
View Datasheet →PIC16F628-04I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F627-04I/SS Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-Bit |
| Core Architecture | Harvard / RISC |
| Instruction Set | 35 single-word instructions |
| Program Memory (Flash) | 1.75 KB (1K x 14) |
| Data RAM | 224 bytes |
| Data EEPROM | 128 bytes |
| Maximum Clock Frequency | 4 MHz (04 speed grade) |
| Instruction Execution Time | 200 ns @ 4 MHz |
| Supply Voltage (VDD) | 2.0 V to 5.5 V |
| I/O Pins | 16 |
| Communication Modules | USART (SCI) |
| Analog Peripherals | 2 comparators, 10-bit ADC core |
| PWM / CCP | 1 Capture/Compare/PWM module |
| Timers | Timer0, Timer1, Timer2 (8/16-bit) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 20-pin SSOP (5.30 mm body) |
| Mounting Type | Surface Mount |
| MSL Level | 1 |
| RoHS Status | Compliant (lead-free SSOP) |
| Lead-Free / Halogen-Free | Lead-free; halogen status not explicitly stated in snippet |
PIC16F627-04I/SS Pin Configuration
| Pin 1 | RA7/OSC1 — General I/O / crystal oscillator input |
| Pin 2 | RA6/OSC2 — General I/O / crystal oscillator output |
| Pin 3 | RA0/AN0 — GPIO / analog input channel 0 |
| Pin 4 | RA1/AN1 — GPIO / analog input channel 1 |
| Pin 5 | RA2/AN2/CVREF — GPIO / analog input / comparator Vref |
| Pin 6 | RA3/AN3/CMP1 — GPIO / analog / comparator 1 output |
| Pin 7 | RA4/T0CKI/CMP2 — GPIO / Timer0 clock / comparator 2 output |
| Pin 8 | RA5/MCLR/VPP — GPIO / Master Clear (reset) / programming voltage |
| Pin 9 | VSS — Ground reference |
| Pin 10 | RB0/INT — GPIO / external interrupt |
| Pin 11 | RB1/RX/DT — GPIO / USART RX / data |
| Pin 12 | RB2/TX/CK — GPIO / USART TX / clock |
| Pin 13 | RB3/CCP1 — GPIO / Capture-Compare-PWM |
| Pin 14 | RB4/PGM — GPIO / low-voltage programming |
| Pin 15 | RB5 — GPIO |
| Pin 16 | RB6/PGC — GPIO / ICSP clock |
| Pin 17 | RB7/PGD — GPIO / ICSP data |
| Pin 18 | VDD — Positive supply 2.0-5.5 V |
| Pin 19 | VSS — Ground reference |
| Pin 20 | RA6 — GPIO (port A pin 6 alternate) |
Typical Applications
PIC16F627-04I/SS is suitable for 6 applications: Industrial Sensor Interface Module, Low-Cost Remote Control / RF Transmitter, LED Lighting Controller (DMX/DALI Slave), Automotive Interior Auxiliary Module, Smart Sensor / IoT Edge Node, Consumer Appliance Control Board.
Industrial Sensor Interface Module
The PIC16F627-04I/SS is well suited for industrial sensor-interface boards that need a small, deterministic 8-bit core with industrial -40C to +85C tolerance. Its 10-bit ADC core, two analog comparators, and 16 digital I/O pins let a single chip read thermistors, photo-diodes, and 4-20 mA loops while driving relay drivers. The 1.75 KB Flash holds 1K 14-bit instructions, plenty for sensor linearization tables and Modbus framing; 224 B RAM handles small packet buffers. The 20-pin SSOP footprint allows compact DIN-rail-mount PCBAs. Pair it with a MAX485 RS-485 transceiver for multi-drop sensor buses and a TPS7A30 LDO for clean analog supply.
Recommended
Low-Cost Remote Control / RF Transmitter
For sub-1 GHz or 315/433 MHz remote-control transmitters, the PIC16F627-04I/SS provides 4 MIPS processing with a 200 ns instruction cycle - sufficient for generating Manchester or PWM-encoded RF frames. The 16 I/O pins accept button matrix scanning, and the USART handles one-wire or UART peripherals. The 2.0V-5.5V supply range enables battery-powered designs (2x AA cells). Low-power sleep modes plus brown-out reset extend coin-cell life. Combined with a SAW-resonator-based TX module, this PIC encodes long-press/double-press events and security rolling codes.
Recommended
LED Lighting Controller (DMX/DALI Slave)
The PIC16F627-04I/SS can serve as the slave MCU in DMX-512 or DALI lighting fixtures. Its USART handles DMX-512 at 250 kbaud while the CCP/PWM module drives a constant-current LED driver from 0-100% dim. The internal 4 MHz oscillator eliminates external crystal cost, and 1.75 KB Flash accommodates small address-decoding and fade-curve tables. Industrial temperature grade ensures reliable operation in sealed luminaires. The 20-pin SSOP footprint lets the controller share space with the LED driver IC. Pair it with an NCL30000 or AL9910 LED driver for high-efficiency dimming.
Recommended
Automotive Interior Auxiliary Module
Although the PIC16F627-04I/SS is not AEC-Q100 qualified, its industrial -40C to +85C range and 2.0V-5.5V supply accommodate under-dash and interior-cabin modules. Typical use cases include seat-position encoders, HVAC mode selectors, and ambient-light controllers. The 10-bit ADC reads photodiodes for auto-dimming; the USART talks to the body-control module; PWM drives small interior lamps. For AEC-Q100 designs, upgrade to PIC16F1823-I/SS or PIC16F1936-I/SS which retain the same architectural footprint. Pair this PIC with a TJA1027 LIN transceiver for body-network connectivity.
Recommended
Smart Sensor / IoT Edge Node
For battery-powered IoT sensor nodes that wake periodically to transmit sensor data, the PIC16F627-04I/SS offers low sleep current and a fast instruction cycle for quick radio-handshake sequences. The PIC16F62X family supports interrupt-driven wake-up from sleep on pin change or comparator events, enabling years of battery life from a CR2032 cell. Use the ADC core to digitize temperature, humidity, or gas-sensor outputs, then transmit over UART to a sub-GHz or BLE companion module. 1.75 KB Flash accommodates small sensor-fusion routines.
Recommended
Consumer Appliance Control Board
Small kitchen and household appliances (coffee makers, slow cookers, dehumidifiers, washing-machine sub-boards) frequently use the PIC16F627-04I/SS as the primary controller. The PIC drives triac-controlled heater elements via opto-isolators, reads NTC thermistors through the ADC, scans membrane keypads, and manages buzzer PWM. The 2.0V-5.5V supply aligns with rectified mains-derived 5 V rails. The 20-pin SSOP footprint is compact enough for sub-$0.50 BOM. The internal brown-out reset and watchdog timer improve field reliability. Pair with a MOC3021 triac driver for mains switching.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F627-04I/SS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F627-04/SS | PIC16F627A-I/SS | PIC16F628-04I/SS | PIC16F627-04I/SO | PIC16F627-04E/SS |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP |
| Program Memory (Flash) | 1.75 KB | 1.75 KB | 1.75 KB | 3.5 KB | 1.75 KB | 1.75 KB |
| Data RAM | 224 bytes | 224 bytes | 224 bytes | 224 bytes | 224 bytes | 224 bytes |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Operating Temperature | -40 C to +85 C | 0 C to +70 C (commercial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (extended) |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 16 | 16 | 16 | 16 | 16 | 16 |
| EEPROM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
Key Differentiators
- Industrial temperature grade (-40C to +85C) versus commercial 0C-70C variant (vs PIC16F627-04/SS)
- Latest silicon revision 'A' with improved ADC accuracy and lower power (vs PIC16F627A-I/SS)
- Doubled Flash memory at same footprint and pinout (vs PIC16F628-04I/SS)
- Extended temperature range (-40C to +125C) at no additional cost (vs PIC16F627-04E/SS)
Design Notes
Place a 100 nF ceramic decoupling capacitor within 5 mm of the VDD pin (pin 18) and a 10 uF bulk tantalum or aluminum capacitor on the supply rail. The PIC16F627-04I/SS draws typical operating current of <2 mA at 4 MHz / 5 V but spikes during Flash writes. Add a ferrite bead if the supply feeds noisy relay or triac circuits. For sleep-mode battery designs, the brown-out reset threshold defaults to ~4.0 V; configure BOR via CONFIG register if operating below 4 V.
The 20-pin SSOP footprint has 0.65 mm lead pitch, requiring reflow soldering with proper paste stencil aperture design (recommended 0.4 mm stencil thickness). Reserve 0.2 mm copper-to-pad clearance for the exposed leads and avoid placing tall components within 2 mm of the SSOP. For hand-prototyping, use a SSOP-to-DIP adapter PCB to break out the 0.65 mm pitch to 2.54 mm through-hole pins. Route the ICSP clock (RB6) and data (RB7) traces as a short 2-wire pair directly to the PICkit programming header.
Common pitfalls when using the PIC16F627-04I/SS: (1) MCLR pin (RA5) MUST be tied to VDD through a 10 kohm resistor; floating MCLR causes spurious resets. (2) OSC1/OSC2 pins require either a crystal with 22 pF loading capacitors or a proper configuration for internal RC oscillator mode. (3) When migrating from PIC16F84A firmware, the configuration-word bit names differ - re-verify _CONFIG settings. (4) Do not exceed 5.5 V on any I/O pin or the device may latch up; use clamping diodes for ESD-sensitive applications.
The PIC16F627-04I/SS has Schmitt-trigger inputs on most GPIO, but the analog inputs (AN0-AN3) require careful analog trace routing. Keep analog traces short, guard them with a ground plane on both sides, and add a small RC filter (10 ohm + 100 nF) for noisy environments. When using the USART at 9600 baud or higher, ensure the RX line has a 100 kohm pull-up to prevent false start bits. For PWM outputs driving triacs, isolate the MCU ground from the mains side using an opto-coupler (MOC3021) to avoid ground-loop noise coupling into the ADC.
Compliance Information
RoHS compliant per Microchip product page; SSOP-20 is lead-free. Not AEC-Q100 qualified; for AEC-Q100 designs use PIC16F1823-I/SS or PIC16F1936-I/SS. Halogen-free status not explicitly stated in the verified snippet - defaulting to 'unknown'.
